A spreading and drying mechanism for 3D laser printing powder

Abstract

The present invention provides a paving and drying mechanism for 3D laser printing powder, comprising: a rectangular frame, which is combined with a liftable platform to form a printing chamber. A first heater and a second heater are arranged inside the sandwich layer of the frame to heat it. Under the driving force of the driving part, the transverse sealing plate first displaces to release the sealing state of a number of inclined heat dissipation holes in two columns in one horizontal direction, so that heat acts on the single-layer powder in the horizontal direction. After this operation is completed, the driving force of the driving part on the transverse sealing plate disappears, and the driving work on the vertical sealing plate continues. Then the vertical sealing plate displaces to release the sealing state of a number of inclined heat dissipation holes in two columns in one vertical direction, so that heat acts on the single-layer powder in the vertical direction. The drying effects in the two directions received by each layer of powder are carried out sequentially and will not interfere with each other, thereby driving the consistency of the effects in each direction during the drying angle adjustment process and making the drying effect uniform.

Description

Technical Field

[0001] The present invention relates to the technical field of laser 3D printers, and more particularly, to a spreading and drying mechanism for 3D laser printing powder. Background Art

[0002] Laser 3D printing is a type of rapid prototyping technology. 3D printing is based on a digital model, and then the digital program is input into the internal of the 3D printer, enabling the 3D printer to complete the shaping of an object by sintering powder-like metal or other materials layer by layer. During this process, the printing platform needs to rise first and then descend layer by layer during the powder spreading process to cooperate with the printing work.

[0003] Before the printing powder is used for printing work, it needs to be dried. There is a drying device for a ceramic 3D printer with the publication patent number 201810807148.4, which includes a frame and a working area and a drying mechanism provided thereon. The drying mechanism includes an electric heating device and a blower corresponding to the electric heating device. The air supply direction of the blower faces the working area. This patent has the following problems:

[0004] The drying work described in this patent cannot be carried out synchronously with the spreading work, cannot ensure that each layer of powder receives a consistent drying effect, and cannot adjust the angle of the drying work, resulting in the metal powder not receiving a consistent drying force from multiple directions. Summary of the Invention

[0005] The purpose of the present invention is to provide a spreading and drying mechanism for 3D laser printing powder to solve the above problems.

[0006] To achieve the above purpose, an embodiment of the present invention provides a spreading and drying mechanism for 3D laser printing powder, including:

[0007] A rectangular frame, which is combined with a liftable platform to form a printing chamber around the periphery. The printing chamber can spread the printing powder layer by layer through a powder spreading mechanism;

[0008] A frame sandwich layer, which is arranged at the central position of the rectangular frame;

[0009] A drying part, which is arranged in the frame sandwich layer in two groups mirror-imaged along the diagonal of the rectangular frame;

[0010] Inclined heat discharge holes, several of which are arranged in two columns along the trajectory of the frame shape on the inner wall of the rectangular frame and communicate with the frame sandwich layer;

[0011] The drying section includes a first heater horizontally arranged inside the border sandwich layer, a horizontal sealing plate arranged inside the border sandwich layer away from the first heater and capable of closing several of the inclined heat dissipation holes in two columns in one direction, a second heater vertically arranged inside the border sandwich layer, a vertical sealing plate arranged inside the border sandwich layer away from the second heater and capable of closing several of the inclined heat dissipation holes in two columns in the other direction, and a driving section arranged inside the border sandwich layer and meshing with the horizontal sealing plate and the vertical sealing plate;

[0012] Drive the driving section, and the driving section can intermittently drive the horizontal sealing plate and the vertical sealing plate to displace, so that several of the inclined heat dissipation holes in two columns in two directions sequentially discharge the heat of the first heater and then dry the printing powder after the second heater.

[0013] Further, the driving section includes two first tooth blocks arranged on the horizontal sealing plate, a motor arranged in the border sandwich layer, a first roller arranged on the motor, a second tooth block arranged on the first roller and capable of meshing with the two first tooth blocks, and a first gear rotatably arranged in the border sandwich layer and capable of meshing with the second tooth block; wherein

[0014] Drive the motor, and the first roller can drive the two first tooth blocks to displace and the first gear to rotate through the second tooth block, so that the two first tooth blocks drive the horizontal sealing plate to displace and then open several of the inclined heat dissipation holes in two columns in one direction.

[0015] Further, the driving section further includes a second gear rotatably arranged in the border sandwich layer and capable of meshing with the first gear, a disc arranged at the upper end of the second gear, a third tooth block arranged on the disc, and a gap between two fourth tooth blocks arranged on the vertical sealing plate and capable of meshing with the third tooth block, wherein

[0016] The first gear can drive the second gear to rotate, so that the second gear drives the third tooth block to rotate through the disc, so that the third tooth block drives the vertical sealing plate to move through the two fourth tooth blocks and then open several of the inclined heat dissipation holes in the other direction.

[0017] Further, several inclined through holes are arranged on the horizontal sealing plate and the vertical sealing plate;

[0018] The several inclined through holes correspond to the several inclined heat dissipation holes one by one.

[0019] Further, the spreading and drying mechanism for 3D laser printing powder further includes a radial part resetting section;

[0020] The radial part resetting part includes eight guide sleeves arranged in pairs of frames on four directions of the frame interlayer;

[0021] Two of the eight guide sleeves are respectively placed outside two of the transverse sealing plates and two of the vertical sealing plates, where

[0022] The transverse sealing plates and the vertical sealing plates are adapted to displace along the guide sleeves.

[0023] Further, the radial part resetting part further includes three arc grooves arranged on three faces of each of the guide sleeves and three runners rotatably arranged in the three arc grooves;

[0024] The three runners at different positions can laterally abut against the transverse sealing plates and the vertical sealing plates;

[0025] When the transverse sealing plates and the vertical sealing plates displace, they can drive the runners to frictionally rotate.

[0026] Further, the radial part resetting part further includes four groups of bending springs;

[0027] Two of the groups of bending springs are arranged between two of the guide sleeves and two of the transverse sealing plates;

[0028] Another two of the groups of bending springs are arranged between two of the guide sleeves and two of the vertical sealing plates, where

[0029] When the transverse sealing plates and the vertical sealing plates displace, the bending springs can be stretched.

[0030] Further, the 3D laser printing powder spreading and drying mechanism further includes a moisture absorption group;

[0031] The moisture absorption group includes two first arc holes arranged on the same-plane housing of the scanning head and two second arc holes arranged on the same-plane housing of the scanning head;

[0032] The two second arc holes are placed outside the two first arc holes and shield two gaps of the two first arc holes;

[0033] The two second arc holes and the two first arc holes are connected to an external air suction device through a main pipe.

[0034] Further, several of the inclined heat dissipation holes in adjacent rows are arranged in a staggered and parallel manner;

[0035] And the distance between two of the inclined heat dissipation holes in a single row is equal to the aperture of the inclined heat dissipation holes in another row.

[0036] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: The first heater and the second heater are arranged inside the frame sandwich layer and can heat it. Under the driving force of the driving part, the transverse sealing plate first displaces, releasing the sealing state of a number of inclined heat dissipation holes in two columns in one horizontal direction, so that heat acts on the single-layer powder in the horizontal direction. After this operation is completed, the driving force of the driving part on the transverse sealing plate disappears, and the driving work continues on the vertical sealing plate. Then the vertical sealing plate displaces, releasing the sealing state of a number of inclined heat dissipation holes in two columns in one vertical direction, so that heat acts on the single-layer powder in the vertical direction. The drying effects in two directions received by each layer of powder are carried out sequentially and will not interfere with each other, thereby driving the consistency of the effects in each direction during the drying angle adjustment process and making the drying effect uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the drawings and embodiments.

[0038] Figure 1 Shows a three-dimensional view of the present invention;

[0039] Figure 2 Shows a schematic top view of the interior of a rectangular frame of the present invention;

[0040] Figure 3 Shows the Figure 2 enlarged view at A in the present invention;

[0041] Figure 4 Shows a front view of the second gear connecting disc of the present invention;

[0042] Figure 5 Shows a schematic structural view of the transverse sealing plate and the vertical sealing plate of the present invention;

[0043] Figure 6 Shows a top view of the transverse sealing plate connecting the bending spring of the present invention;

[0044] Figure 7 Shows a schematic front view of the interior of the radial reset part of the present invention;

[0045] Figure 8 Shows a bottom view of the moisture absorption group of the present invention.

[0046] In the figure

[0047] 1. Rectangular frame;

[0048] 2. Liftable platform;

[0049] 3. Printing chamber;

[0050] 4. Frame sandwich layer;

[0051] 5. Drying section; 51. First heater; 52. Horizontal sealing plate; 53. Second heater; 54. Vertical sealing plate;

[0052] 55. Driving section; 551. First tooth block; 552. Motor; 553. First roller; 554. Second tooth block; 555. First gear; 556. Second gear; 557. Disc; 558. Third tooth block; 559. Fourth tooth block;

[0053] 6. Inclined through hole;

[0054] 7. Radial part reset section; 71. Guide sleeve; 72. Arc groove; 73. Runner; 74. Bending spring;

[0055] 8. Moisture absorption group; 81. First arc hole; 82. Second arc hole;

[0056] 9. Inclined heat discharge hole;

[0057] 10. Laser 3D printer main body. Detailed implementation mode

[0058] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic way, so they only show the components related to the present invention.

[0059] Please refer to Figure 1 , Figure 1 which shows the three-dimensional view of the present invention; please refer to Figure 2 , Figure 2 which shows the internal schematic top view of the rectangular frame of the present invention; please refer to Figure 3 , Figure 3 which shows the Figure 2 enlarged view at A in Figure 4 , Figure 4 which shows the front view of the connection between the second gear and the disc of the present invention; as Figures 1-4 shown, a spreading and drying mechanism for 3D laser printing powder includes:

[0060] Rectangular frame 1, the rectangular frame 1 is combined with the periphery of the liftable platform 2 to form a printing chamber 3, and the printing chamber 3 can spread the printing powder layer by layer through the powder spreading mechanism; each time the powder spreading mechanism spreads a layer of powder on the liftable platform 2, the liftable platform 2 can descend a height according to the situation.

[0061] Border sandwich layer 4, the border sandwich layer 4 is arranged at the central position of the rectangular frame 1;

[0062] Drying section 5, the drying section 5 is arranged in the border sandwich layer 4 in two groups mirror-imaged along the diagonal of the rectangular frame 1;

[0063] The inclined heat discharge holes 9, and a plurality of the inclined heat discharge holes 9 are arranged in two columns along the trajectory of the frame shape on the inner wall of the rectangular frame 1 and communicate with the frame interlayer 4; the output end of the inclined heat discharge hole 9 is lower than the input end of the inclined heat discharge hole 9, and the heat can act well on the upper end surface of the powder;

[0064] The drying part 5 includes a first heater 51 horizontally arranged inside the frame interlayer 4, a horizontal sealing plate 52 arranged inside the frame interlayer 4 away from the first heater 51 and capable of closing a plurality of the inclined heat discharge holes 9 in two columns in one direction, a second heater 53 vertically arranged inside the frame interlayer 4. The first heater 51 and the second heater 53 can emit hot air, which belongs to the prior art and will not be described in detail here. A vertical sealing plate 54 arranged inside the frame interlayer 4 away from the second heater 53 and capable of closing a plurality of the inclined heat discharge holes 9 in two columns in the other direction, and a driving part 55 arranged inside the frame interlayer 4 and meshing with the horizontal sealing plate 52 and the vertical sealing plate 54. The two driving parts 55 are electrically connected to the controller, and under the action of the controller, the two driving parts 55 can exchange work;

[0065] Driving the driving part 55, the driving part 55 can intermittently drive the horizontal sealing plate 52 and the vertical sealing plate 54 to displace, so that a plurality of the inclined heat discharge holes 9 in two columns in two directions sequentially discharge the heat of the first heater 51 and the second heater 53 to dry the printing powder. Specifically, compared with the prior art, the first heater 51 and the second heater 53 are arranged inside the frame interlayer 4 to heat it. Under the driving force of the driving part 55, the horizontal sealing plate 52 first displaces, releasing the closed state of a plurality of the inclined heat discharge holes 9 in two columns in one horizontal direction, so that the heat acts on the single-layer powder in the horizontal direction. After this operation is completed, the driving force of the driving part 55 on the horizontal sealing plate 52 disappears, and the driving work on the vertical sealing plate 54 continues. The vertical sealing plate 54 then displaces, releasing the closed state of a plurality of the inclined heat discharge holes 9 in two columns in one vertical direction, so that the heat acts on the single-layer powder in the vertical direction. The drying effects in two directions received by each layer of powder are carried out sequentially and will not interfere with each other, thereby driving the consistency of the effects in each direction during the drying angle adjustment process and making the drying effect uniform.

[0066] Optionally, the driving part 55 includes two first tooth blocks 551 arranged on the horizontal sealing plate 52, a motor 552 arranged in the frame interlayer 4, a first roller 553 arranged on the motor 552, a second tooth block 554 arranged on the first roller 553 and capable of meshing with the two first tooth blocks 551, and a first gear 555 rotatably arranged in the frame interlayer 4 and capable of meshing with the second tooth block 554; wherein

[0067] Drive the motor 552, and the first roller 553 can drive the displacement of the two first tooth blocks 551 and the rotation of the first gear 555 through the second tooth block 554, so that the two first tooth blocks 551 drive the lateral sealing plate 52 to move and open a number of the inclined heat dissipation holes 9 in two columns in one direction. Specifically, the motor 552 drives the first roller 553 to rotate, the rotation of the first roller 553 drives the second tooth block 554 to rotate, and the rotation of the second tooth block 554 pushes the two first tooth blocks 551. In this way, the lateral sealing plate 52 can move under force to meet the heat dissipation requirements of a number of the inclined heat dissipation holes 9 in two columns in the horizontal direction. After the second tooth block 554 pushes the two first tooth blocks 551, it moves away from the two first tooth blocks 551 and no longer works on the lateral sealing plate 52, avoiding the synchronous drive of the motor 552 for the lateral sealing plate 52 and the vertical sealing plate 54. And immediately after the second tooth block 554 moves away from the two first tooth blocks 551, it drives the first gear 555 to transmit power, providing a good prerequisite for the movement of the vertical sealing plate 54.

[0068] Optionally, the driving part 55 further includes a second gear 556 rotatably arranged in the frame sandwich layer 4 and capable of meshing with the first gear 555, a disc 557 arranged at the upper end of the second gear 556, a third tooth block 558 arranged on the disc 557, and a gap between two fourth tooth blocks 559 arranged on the vertical sealing plate 54 and capable of meshing with the third tooth block 558, where

[0069] The first gear 555 can drive the second gear 556 to rotate, so that the second gear 556 drives the third tooth block 558 to rotate through the disc 557, so that the third tooth block 558 drives the vertical sealing plate 54 to move through the two fourth tooth blocks 559 and open a number of the inclined heat dissipation holes 9 in the other direction. Specifically, the rotation of the first gear 555 drives the rotation of the second gear 556, the rotation of the second gear 556 drives the concentric rotation of the disc 557, and the rotation of the disc 557 drives the rotation of the third tooth block 558 to rotate the two fourth tooth blocks 559, so that the two fourth tooth blocks 559 drive the vertical sealing plate 54 to meet the heat dissipation requirements of a number of the inclined heat dissipation holes 9 in two columns in the vertical direction. After the third tooth block 558 pushes the two fourth tooth blocks 559, it moves away from the two fourth tooth blocks 559 and no longer works on the vertical sealing plate 54, so as to ensure the coordination of the drying work in each direction.

[0070] Please refer to Figure 5 , Figure 5 shows a schematic structural diagram of the lateral sealing plate and the vertical sealing plate of the present invention; as Figure 5 shown, a number of inclined through holes 6 are provided on the lateral sealing plate 52 and the vertical sealing plate 54;

[0071] A number of the inclined through-holes 6 correspond to a number of the inclined heat-dissipating holes 9 one by one. Specifically, a number of the inclined through-holes 6 move along with the movement of the horizontal sealing plate 52 and the vertical sealing plate 54. The angles and shapes of a number of the inclined through-holes 6 and a number of the inclined heat-dissipating holes 9 are the same, ensuring that the closing and dredging operations of the horizontal sealing plate 52 and the vertical sealing plate 54 on a number of the inclined through-holes 6 are not obstructed.

[0072] The patent also has the following problems:

[0073] The process of the horizontal sealing plate 52 and the vertical sealing plate 54 moving cannot be limited;

[0074] Please refer to Figure 6 , Figure 6 which shows a top view of the connection of the horizontal sealing plate of the present invention to a bending spring; please refer to Figure 7 , Figure 7 which shows a front internal schematic view of the radial part reset part of the present invention; as Figures 6-7 shown;

[0075] The spreading and drying mechanism for 3D laser printing powder further includes a radial part reset part 7;

[0076] The radial part reset part 7 includes eight guide sleeves 71 arranged in pairs on four directions of the frame sandwich 4 of the frame;

[0077] Eight of the guide sleeves 71 are respectively placed outside two of the horizontal sealing plates 52 and two of the vertical sealing plates 54, where

[0078] the horizontal sealing plate 52 and the vertical sealing plate 54 are adapted to displace along the guide sleeves 71. Specifically, the guide sleeves 71 at different positions can limit the horizontal sealing plate 52 and the vertical sealing plate 54 at different positions, preventing the movement trajectories of the horizontal sealing plate 52 and the vertical sealing plate 54 from deviating and ensuring the stability of their opening and closing operations on a number of the inclined through-holes 6.

[0079] Optionally, the radial part reset part 7 further includes three arc-shaped grooves 72 arranged on three surfaces of each of the guide sleeves 71 and three rotating wheels 73 rotatably arranged in the three arc-shaped grooves 72;

[0080] Three of the rotating wheels 73 at different positions can laterally abut against the horizontal sealing plate 52 and the vertical sealing plate 54;

[0081] When the horizontal sealing plate 52 and the vertical sealing plate 54 displace, they can drive the rotating wheels 73 to frictionally rotate. Specifically, the arc-shaped grooves 72 provide a good rotation accommodation space for the rotating wheels 73, and the rotating wheels 73 can provide a sliding support force for the horizontal sealing plate 52 and the vertical sealing plate 54 in the arc-shaped grooves 72, reducing the sliding resistance of the horizontal sealing plate 52 and the vertical sealing plate 54 and improving the smoothness of their operations.

[0082] This patent also has the following problems;

[0083] After the lateral sealing plate 52 and the vertical sealing plate 54 are moved, they cannot be reset;

[0084] Optionally, the radial reset part 7 further includes four groups of bending springs 74;

[0085] Two of the groups of bending springs 74 are arranged between the two guide sleeves 71 and the two lateral sealing plates 52;

[0086] The other two groups of bending springs 74 are arranged between the two guide sleeves 71 and the two vertical sealing plates 54, where

[0087] When the lateral sealing plate 52 and the vertical sealing plate 54 are displaced, the bending springs 74 can be stretched. Specifically, the bending springs 74 at different positions stretch and store energy as the lateral sealing plate 52 and the vertical sealing plate 54 move. When they are no longer under force, the bending springs 74 release the stored energy to reset the lateral sealing plate 52 and the vertical sealing plate 54 to their initial positions.

[0088] This patent also has the following problems;

[0089] The moisture in the wet powder after being heated cannot be discharged in time;

[0090] Please refer to Figure 8 , Figure 8 , which shows a bottom view of the moisture absorption group of the present invention; as Figure 7 shown, the spreading and drying mechanism for 3D laser printing powder further includes a moisture absorption group 8;

[0091] The moisture absorption group 8 includes two first arc-shaped holes 81 arranged on the same-plane housing of the scanning head and two second arc-shaped holes 82 arranged on the same-plane housing of the scanning head;

[0092] The two second arc-shaped holes 82 are placed outside the two first arc-shaped holes 81 and cover two gaps of the two first arc-shaped holes 81;

[0093] The two second arc-shaped holes 82 and the two first arc-shaped holes 81 are connected to an external suction device through a main pipe. Specifically, the scanning head is a laser scanning device far from the printing chamber 3, which is a publicly available technology and will not be described in detail here. The two first arc-shaped holes 81 and the two second arc-shaped holes 82 are concentrically arranged on the scanning head, and the angle between the two first arc-shaped holes 81 and the two second arc-shaped holes 82 is 90 degrees, and they can form a complete circumferential surface, so that the moisture generated by the powder under the drying effect can be efficiently discharged comprehensively, improving the working efficiency.

[0094] Optionally, several adjacent rows of the inclined heat discharge holes 9 are arranged in a staggered and parallel manner;

[0095] Moreover, the distance between two adjacent ones of the inclined heat discharge holes 9 in a single row is equal to the hole diameter of the inclined heat discharge holes 9 in the other row. Specifically, the positions of the inclined heat discharge holes 9 are arranged such that there is no drying dead angle on one surface, ensuring the scope and refinement of powder drying.

[0096] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A spreading and drying mechanism for 3D laser printing powder, characterized in that, it includes: A rectangular frame (1), the rectangular frame (1) is combined with a liftable platform (2) to form a printing chamber (3) around it, and the printing chamber (3) can spread the printing powder layer by layer through a powder spreading mechanism; A frame sandwich layer (4), the frame sandwich layer (4) is arranged at the center position of the rectangular frame (1); A drying part (5), the drying part (5) is arranged in the frame sandwich layer (4) in two groups mirror-imaged along the diagonal of the rectangular frame (1); Inclined heat exhaust holes (9), several of the inclined heat exhaust holes (9) are arranged in two columns along the track of the frame shape on the inner wall of the rectangular frame (1) and communicate with the frame sandwich layer (4); The drying part (5) includes a first heater (51) horizontally arranged in the frame sandwich layer (4), a horizontal sealing plate (52) arranged in the frame sandwich layer (4) away from the first heater (51) and capable of closing several of the inclined heat exhaust holes (9) in two columns in one direction, a second heater (53) vertically arranged in the frame sandwich layer (4), a vertical sealing plate (54) arranged in the frame sandwich layer (4) away from the second heater (53) and capable of closing several of the inclined heat exhaust holes (9) in two columns in the other direction, and a driving part (55) arranged in the frame sandwich layer (4) and meshing the horizontal sealing plate (52) and the vertical sealing plate (54); Driving the driving part (55), the driving part (55) can intermittently drive the horizontal sealing plate (52) and the vertical sealing plate (54) to displace, so that several of the inclined heat exhaust holes (9) in two columns in two directions can discharge the heat of the first heater (51) and the second heater (53) in sequence to dry the printing powder.

2. A spreading and drying mechanism for 3D laser printing powder according to claim 1, characterized in that, The driving part (55) includes two first tooth blocks (551) arranged on the horizontal sealing plate (52), a motor (552) arranged on the frame sandwich layer (4), a first roller (553) arranged on the motor (552), a second tooth block (554) arranged on the first roller (553) and capable of meshing the two first tooth blocks (551), and a first gear (555) rotatably arranged on the frame sandwich layer (4) and capable of meshing the second tooth block (554); Wherein Driving the motor (552), the first roller (553) can drive the two first tooth blocks (551) to displace and the first gear (555) to rotate through the second tooth block (554), so that the two first tooth blocks (551) drive the horizontal sealing plate (52) to displace and open several of the inclined heat exhaust holes (9) in two columns in one direction.

3. A spreading and drying mechanism for 3D laser printing powder according to claim 2, characterized in that, The driving part (55) further includes a second gear (556) rotatably arranged in the frame sandwich layer (4) and capable of meshing with the first gear (555), a disc (557) arranged at the upper end of the second gear (556), a third tooth block (558) arranged on the disc (557), and a gap between two fourth tooth blocks (559) arranged on the vertical sealing plate (54) and capable of meshing with the third tooth block (558), wherein the first gear (555) can drive the second gear (556) to rotate, so that the second gear (556) drives the third tooth block (558) to rotate through the disc (557), so that the third tooth block (558) drives the vertical sealing plate (54) to move through the two tooth blocks (559) and then opens a number of the inclined heat dissipation holes (9) in another direction.

4. A spreading and drying mechanism for 3D laser printing powder according to claim 3, characterized in that a number of inclined through holes (6) are arranged on the transverse sealing plate (52) and the vertical sealing plate (54); the number of the inclined through holes (6) corresponds to the number of the inclined heat dissipation holes (9) one by one.

5. A spreading and drying mechanism for 3D laser printing powder according to claim 4, characterized in that the spreading and drying mechanism for 3D laser printing powder further includes a radial part resetting part (7); the radial part resetting part (7) includes eight guide sleeves (71) arranged in pairs at four directions of the frame sandwich layer (4) along the frame; the eight guide sleeves (71) are respectively arranged outside the two transverse sealing plates (52) and the two vertical sealing plates (54) in pairs, wherein the transverse sealing plate (52) and the vertical sealing plate (54) are adapted to displace along the guide sleeves (71).

6. A spreading and drying mechanism for 3D laser printing powder according to claim 5, characterized in that the radial part resetting part (7) further includes three arc-shaped grooves (72) arranged on three surfaces of each guide sleeve (71) and three runners (73) rotatably arranged in the three arc-shaped grooves (72); the three runners (73) at different positions can laterally abut against the transverse sealing plate (52) and the vertical sealing plate (54); when the transverse sealing plate (52) and the vertical sealing plate (54) displace, they can drive the runners (73) to frictionally rotate.

7. A spreading and drying mechanism for 3D laser printing powder according to claim 6, characterized in that the radial part resetting part (7) further includes four groups of bending springs (74); two of the groups of bending springs (74) are arranged between the two guide sleeves (71) and the two transverse sealing plates (52); the other two groups of bending springs (74) are arranged between the two guide sleeves (71) and the two vertical sealing plates (54), wherein when the transverse sealing plate (52) and the vertical sealing plate (54) displace, the bending springs (74) can be stretched.

8. A spreading and drying mechanism for 3D laser printing powder according to claim 7, characterized in that The spreading and drying mechanism for 3D laser printing powder further includes a moisture absorption group (8); The moisture absorption group (8) includes two first arc-shaped holes (81) arranged on the same-plane housing of the scanning head and two second arc-shaped holes (82) arranged on the same-plane housing of the scanning head; The two second arc-shaped holes (82) are placed outside the two first arc-shaped holes (81) and cover two gaps of the two first arc-shaped holes (81); The two second arc-shaped holes (82) and the two first arc-shaped holes (81) are connected to an external suction device through a main pipe.

9. The spreading and drying mechanism for 3D laser printing powder according to claim 1, characterized in that, A number of the adjacent two rows of the inclined heat discharge holes (9) are arranged in a staggered and parallel manner; And the distance between two inclined heat discharge holes (9) in a single row is equal to the aperture of the inclined heat discharge holes (9) in the other row.

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